Song of Stupefaction

Weakening auras are usually a bad rate on purpose: an enchantment that only shrinks a creature ties up a card without removing anything, so it lives or dies on how much shrink it buys per mana. This one flips that math by folding the mill into the payment. The enter trigger fuels the same graveyard that the -X/-0 counts, so casting it is the first installment on its own power level, and every permanent that later dies or gets discarded pushes X higher. The clause worth sitting with is that it cuts power, never toughness. It cannot trade up into a kill on its own; it exists to blank a combat-relevant body, to zero out an attacker so it stops threatening damage while the graveyard keeps growing beneath it. That restriction is what lets the count scale without becoming a repeatable removal engine: a self-mill build can push X into double digits and still only be turning off offense, not clearing blockers or killing anything outright. Note too that reducing power does nothing to an activated ability, so a creature that taps for value keeps doing its job unmolested; this answers what swings, not what functions. It borrows the fathomless-descent count to reward a strategy already committed to filling the graveyard, which makes it a control valve for aggression in a mill-adjacent shell rather than a standalone answer.